It will be nice to test the vegetable oil system with 4 inches of snow on top of it.
The front axle will not engage. Dodge has a vacuum actuator that couples together the 2 piece right axle illuminating the 4wd indicator light in the dash. This is a troublesome issue to 4 wheel drive owners. All manufacturers have went to something similar to this.
Replacement vacuum actuators can be had for $90. The Posi-Lock 4x4 system found here can be had for $200.
I fixed the problem by taking the actuator apart and reinstalling it in the 4wd position. Eventually I will replace it with the Posi-lock as soon as possible.
Found the vacuum link and put some rubber cement on it. No trouble for the last two years.